public class TryCatchDemo {
    public static void main(String[] args) {
        System.out.println("程序开始了...");
        try {
            String str = null;
            //String str = "a";
            //System.out.println(str.length());
            //System.out.println(str.charAt(0));
            //System.out.println(Integer.parseInt(str));
            System.out.println("!!!!!!!!!!!!");
        } catch (NullPointerException | StringIndexOutOfBoundsException e) {
            System.out.println("处理空指针或下标越界！");
        }catch (Exception e){
            System.out.println("反正就是出了个错");
        }
        System.out.println("程序结束了");
    }
}
